Setting aside the cost (let's face it, Mongoose is here to make money, not friends), this is a playable version of Classic Traveller. I'm refereeing a crew who are happily pootling around a solar system doing stuff, and the rules are accessible for both the newbies and the 80s OG. The rule book is relatively simply laid out, with a minimal number of "hidden" rules that pop up in inaccessible parts.
Thus far my only criticism is the low-skill character-generation mechanism and the relatively high-stakes difficulty dynamic that forms the fundamentals of the game. Because characters never seem to muster out with greater than +2 on any skill, most realistic difficulty checks run at real-time (you can make tasks easier by slowing down an action) are 40-60 split on fail/pass...